So, I'm new to Magic: The Gathering. I was brought into the game casually with a group of friends. I decided one day to buy my own Deckbuilder's Toolkit and build my own deck. I ended up creating a semi-descent deck, but I know it can be better. I know building a deck can be very advanced, and I want to take it to the next level. So please give me any advice to building a deck, wether it's choosing a color or deciding the theme of the deck. Thank you.